使用振型叠加法以及模态截断法分别求解物体振动位移（附详细说明报告）-Using the mode superposition method and the modal truncation method were used to solve the vibration displacement of the object (with detailed reporting)

模态分析，用FFT对输入的激励信号提取振动的频率-Modal analysis using FFT excitation signal input to extract vibration frequency